Fourniture de données personnelles, respect de la vie privée et propension au mensonge sur Internet

This research proposes to study users’ perceptions and behaviours when a commercial site wants them to fill a form on line. We propose to substitute the trust/risk approach with a cost/benefit approach, through the concept of perceived value. This allows taking into account the dilemma often felt by the user when he has to take the decision to provide the required data: do I have more to lose or to gain to reveal this information? We thus propose to test here a model aiming at determining the propensity of the users to answer a request of personal data on line and to provide or not erroneous data. We establish that the privacy concerns and the perceived value of the exchange have an effect on the reaction to the request in terms of filling the form and giving or not erroneous data. We also show that the sensitivity of the data results in a particular behaviour

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Kirsch et al. (2002; 2010) highlight the control of IS projects. For them there are complementarities between formal and informal control to evaluate IS projects. In this article, we show clearly that in IS projects the evaluation is a simultaneous mix of formal and informal control. This paper presents a management tool to estimate the project's budgetary and planning deviations and one other management tool to simulate the probabilities of deviation in uncertain environment (extraction and valuation of tasks in MS project). We test our cost based model on a projects' population. We then enrich the theorythrough the hybrid indicators introduction which combine informal and formal control. Our methodology is inductive and we generalize our results from the research and development of Information systems projects in computer industry (ISDP) to the (ISP) information system project (Baskerville et al., 2004

Agilité des données et structure organisationnelle : le cas Total. vol.3, n°1.

International audienc

Three-dimensional linear stability analysis of the flow around a sharp 180-degree bend

This study seeks to characterise the stability of a two-dimensional channel flow involving a 180-degree sharp bend, to infinitesimal three-dimensional disturbances by way of linear stability analysis. A highly accurate global linear stability analysis of the flow is presented via the Reynolds number Re varies in the range 100 ≤ Re ≤ 700, this Re range produces steady state two-dimensional flow solutions for bend opening ratio (ratio of bend width on inlet height) β = 1. The two-dimensional base flow solutions demonstrate that as β decreases, the transition from steady to unsteady occurs at lower Reynolds number. The stability analysis shows that the flow first becomes unstable to a synchronous three-dimensional instability mode with spanwise wavenumber k = 2 at approximately Re = 400, whereas the two-dimensional solution branch undergoes transition to unsteady flow somewhere near Re ≈ 800. Instability mode structures associated with the leading eigenvalues are localized at the re-attachment point of the first separation bubble and the separation point of the second separation bubble. The stability analysis is used to produce neutral stability curves and visualisations of the global modes of the system for typical Reynolds number are also presented